The rockers' new track concurrently becomes their first appearance on the Hot 100.

I spent days trying to understand what the charts and graphs were telling me ... For some people, however, the fascination with their sleep tracker doesn’t wane — it becomes a stubborn obsession.

"I believe being obsessed with sleep trackers contributes to a lot of sleep ... I spent days trying to understand what the charts and graphs were telling me about my slumber, then finally came ...

The best Fitbit depends on your intended use case, budget, and need for advanced features in an activity tracker.